GROUND DRIVE
– METERING DRIVE SYSTEM
Page
61
05/06
Introduction
The metering system used on your Air
Seeder has been designed to handle a
large range of seeds and fertilizers at
different rates.
Due to the large difference in material
flow rates required on an air seeder i.e. 3
kg/ha of canola to 160 kg/ha plus of peas or
fertilizer, certain adjustments may need to
be made to the meterbox or drive system.
As a guide to when you may need to
make changes to the standard system refer
to the ‘Variator Setting Guide’ (pages 41 to
55) for the various materials being sown.
Variators
The metering system is driven through
a variable speed gearbox. The variators
are mounted next to the meterbox and are
adjusted remotely via cables.
Fig. MD1 Variator Gearbox.
NOTE:
It is recommended that when
adjusting the variator setting the operator
goes past the desired setting (higher rate) a
short distance and then rotates the handle
back to the required setting.
This method of adjustment will ensure
that there is no slack in the cable.
Fig. MD2 Variator Adjustment (2 bin).
All of the main bins metering system
can be set from the one station at different
rates (fig. MD2).
Variator Maintenance
The variator is virtually maintenance
free and will require only a brief inspection to
check that the oil seals on both the input and
output shafts are in good condition. Refer to
the ‘General Maintenance Section’ for further
details.
It is recommended that the oil in the
variator be changed if there is any possibility
that
the
fluid
may
have
suffered
contamination. Oil contamination will occur if
any foreign matter or moisture finds its way
into the sealed housing.
To change the variator oil you will need
to remove the variator from the seeder and
drain the oil at the filling cap. Fill with the
correct oil (refer seeder specifications page
13) and refit the variator.
Oil should be level with the centre line
of the top shaft after filling.
When re-fitting the adjustment arm to
the variator ensure that the variator does not
turn when set at zero. Lock both grub
screws on the arm after setting.
